Final answer:
The quality and quantity of information about products and services of interest to buyers has increased. This is referred to as information density.
Step-by-step explanation:
The correct answer to this question is: a) information density. Information density refers to the amount of information available about products and services of interest to buyers. With advances in technology and globalization, there has been a significant increase in the quality and quantity of information, making it easier for buyers to find the information they need.